postinvalidate源码分析
view中
public void postInvalidate() {
postInvalidateDelayed(0);
}
public void postInvalidateDelayed(long delayMilliseconds) {
// We try only with the AttachInfo because there's no point in invalidating
// if we are not attached to our window
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds);
}
}
public void dispatchInvalidateDelayed(View view, long delayMilliseconds) {
Message msg = mHandler.obtainMessage(MSG_INVALIDATE, view);
mHandler.sendMessageDelayed(msg, delayMilliseconds);
}
switch (msg.what) {
case MSG_INVALIDATE:
((View) msg.obj).invalidate();
break;
其他的和invalidate一样,着我们就可以看到了,postinvalidate在主线程和非主线程中都可以调用,但是Invalidate不能直接在线程中调用
作者:Peakmain
链接:https://www.jianshu.com/p/6c5d65009ba1